Marking of fluorescent lamps
Three tsifirny code on packaging of the lamp contain, as a rule information concerning quality of light (the color rendering index and color temperature).
The first digit the color rendering index in 1х10 Ra (compact fluorescent lamps have 60-98 Ra, thus the higher the index, the color rendition is more reliable).
The second and third digits indicate the color temperature of the lamp.
Thus marking "827" indicates the color rendering index in 80 Ra, and color temperature in 2700 K (that corresponds to the color temperature of the glow lamp).